from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sudden loss of muscle tone and strength, usually caused by an extreme emotional stimulus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An abrupt loss of muscle tone, sometimes associated with narcolepsy.
from the GNU version of the Collaborative International Dictionary of English
- n. A morbid condition caused by an overwhelming shock or extreme fear and marked by rigidity of the muscles.
from The Century Dictionary and Cyclopedia
- n. A sudden nervous shock which immobilizes or paralyzes the subject.
From Greek kataplēxis, fixation (of the eyes), from kataplēssein, to astound, terrify : kata-, intensive pref.; see cata- + plēssein, plēk-, to strike; see plāk-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From German Kataplexie, from Ancient Greek κατάπληξις (kataplēksis). (Wiktionary)